DIANA KRALL and ELVIS COSTELLO attends the premiere of 'No Direction Home: Bob Dylan'. New York City, USA - 19.09.05

A spokesman for the pair has confirmed THE LOOK OF LOVE singer is due in December (06).

The baby will arrive just in time for the couple's third wedding anniversary on 6 December (06).

Veteran English rocker Costello, 51, is currently touring with ALLEN TOUSSAINT in support of their album, THE RIVER IN REVERSE.

Krall, 41, is set to release her new album this September (06).